RG401 M17/129 50 Ohm Semi-Rigid Coaxial Cable MIL-DTL-17 Compliant for RF Systems
RG401 is a MIL-DTL-17 compliant semi-rigid coaxial cable designed for high frequency applications requiring precise impedance control and 100% shielding effectiveness. Unlike flexible or formable coax cables, this 0.250" diameter semi-rigid cable features a solid copper outer conductor that maintains exact spacing between the center conductor and dielectric, delivering consistent 50 Ohm impedance from DC to 19 GHz.
The cable is constructed with a 1.63mm silver-plated copper solid inner conductor, PTFE dielectric at 5.27mm, and a solid copper outer conductor at 6.35mm overall diameter. The semi-rigid outer conductor provides shielding effectiveness exceeding 110 dB, effectively eliminating EMI/RFI interference and making RG401 suitable for high power and sensitive signal applications.
With 3,000V operating voltage (7,500V dielectric withstanding), 69.5% velocity of propagation, and 95-97 pF/m nominal capacitance, RG401 delivers reliable RF transmission up to 19 GHz. At 1 GHz, attenuation is 0.23 dB/m; at 10 GHz, 0.89 dB/m. Power handling at 1 GHz is 914.6W CW, derating to 238.2W at 10 GHz.
DC to 19 GHz frequency range – Mode-free operation supports applications from HF through K-band
Solid copper outer conductor – Provides 100% shielding coverage with >110 dB shielding effectiveness, eliminating signal leakage and external interference
Silver-plated copper inner conductor – Solid conductor with silver plating ensures low loss and corrosion resistance
PTFE dielectric – Solid PTFE insulation delivers stable 50 Ohm impedance, low attenuation, and wide temperature range
3,000V operating voltage – 7,500V dielectric withstanding voltage for high power RF applications
MIL-DTL-17 qualified – Manufactured to M17/129-RG401 and M17/129-00001 specifications for mission-critical defense and aerospace systems
| Item | Material | Diameters (mm) |
|---|---|---|
| Inner Conductor | SC | 1.63 |
| Insulation | PTFE | 5.27 |
| Outer Conductor | BC Tube | 6.35 |
| Capacitance (pF/m) | 95.1 |
|---|---|
| Impedance (Ohms) | 50 |
| Max Voltage (Vrms) | 3000 |
| Max Frequency (GHz) | 19 |
| Bend Radius (mm) | 22.23 |
| Temperature Range (℃) | -55~+125 |
| Frequency (GHz) | Attenuation (dB/m) | Power(watts CW) |
|---|---|---|
| 0.5 | 0.16 | 1332.1 |
| 1.0 | 0.23 | 914.6 |
| 5.0 | 0.58 | 364.4 |
| 10.0 | 0.89 | 238.2 |
Defense and aerospace systems – MIL-DTL-17 qualified for radar, electronic warfare, and avionics applications
High power RF transmission – 1,400W at 1 GHz power handling for broadcast transmitters and radar systems
Test and measurement instrumentation – Precision 50 Ohm impedance and 100% shielding for laboratory calibration and RF test setups
Distributed antenna systems (DAS) – Low PIM versions (<-160dBc) for in-building cellular coverage and 4G/LTE infrastructure
Satellite ground terminals – 19 GHz frequency capability for X-band, Ku-band and K-band uplink/downlink
Microwave radios – Stable phase and low attenuation for point-to-point backhaul links
Electronic warfare systems – 110 dB shielding effectiveness for sensitive receiver front ends
Automotive radar – 77 GHz operation possible with custom configurations
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